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3 1/2' x 8' torsion box #1: Torsion box assembly table

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Blog entry by elcowboy posted 02-11-2011 09:05 PM 2798 reads 1 time favorited 10 comments Add to Favorites Watch
no previous part Part 1 of 3 1/2' x 8' torsion box series no next part

220120112278 Used 5/8” mdf for grid and 1/2” for skins

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220120112282

230120112293

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240120112301 Cleaned the glue off the sides and flush trimmed the skins.

280120112327 Screwed hard board on top and cut with jigsaw.

280120112328 Trimmed hard board with router.

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280120112334 Still need to decide what wood to use to protect the sides of the top. Right now the torsion box is on top of a table i made for a friend, i havn't decided what way i'm going to go with the base. Any suggestions greatly appreciated.



10 comments so far

View elcowboy's profile

elcowboy

24 posts in 1343 days


#1 posted 02-11-2011 10:35 PM

By the way, started this project after watching Mark Spagnuolo’s video and started to drool. : )

View Derek Lyons's profile

Derek Lyons

584 posts in 2221 days


#2 posted 02-12-2011 07:20 PM

I was about to say, if you make a base like Marc’s, you won’t go far wrong – if you don’t put the storage in now, you’ll eventually wish you had. :) Plus his base is absolutely rock solid and stable, something very desirable in an assembly table.

-- Derek, Bremerton WA --

View bigike's profile

bigike

4031 posts in 1941 days


#3 posted 02-12-2011 08:02 PM

great work, I need to make one of these too a bench and a out feed table for my saw to the right and out the back of the saw. I just want it dead flat so I can add a router in the table next to the saw.

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

View rance's profile

rance

4132 posts in 1813 days


#4 posted 02-12-2011 08:14 PM

I want to build one of these eventually. I’ve wondered though, how do you assemble it if you don’t already have an established flat surface to reference from?

Base: If you build a base like a very sturdy workbench and then attach this down to it, what happens when the workbench tries to move over time? I hear about workbenches needing to be flattened from time to time. Then there’s the legs. For an assembly table like this, I’ve considered a 3-legged configuration. Or maybe build the sturdy base you’ve discussed above, but attach this top at 3 points, not in the traditional way.

I’ll be intently listening for everyone’s ideas on this.

Nice table btw.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View elcowboy's profile

elcowboy

24 posts in 1343 days


#5 posted 02-13-2011 07:04 AM

I used four jointed 2×4s, planed at the same time on edge. Those on top of two straight steel square tubes I had lying around. I then layed the skins over the 2×4’s, used a spirit level to check for level and adjusted with shims where needed. Next I assembled the grid. Basically you create a temporary level work surface with the skins of your torsion box to be.

About the base: The grid inside the box is supposed to make it really stiff. The temporary base its on now is smaller than what i think the permanent base is going to be, and this morning i noticed some sag at the ends. Barely noticable but sag none the less. I hope when I build the base it will even out.

View Derek Lyons's profile

Derek Lyons

584 posts in 2221 days


#6 posted 02-15-2011 11:20 PM

@Rance, Marc’s video series on building this table explains how to establish a level and flat reference surface.

@elcowboy, there shouldn’t be any sag AFAIK. You did glue the grid to the skins, right?

-- Derek, Bremerton WA --

View elcowboy's profile

elcowboy

24 posts in 1343 days


#7 posted 02-16-2011 03:37 PM

Yup, waited a day for it to dry before puting it on the little base.

View Derek Lyons's profile

Derek Lyons

584 posts in 2221 days


#8 posted 02-16-2011 09:11 PM

You shouldn’t be getting any sag… sag means something is wrong WRT design or execution. Sag means it’s unreliable as an assembly surface.

-- Derek, Bremerton WA --

View elcowboy's profile

elcowboy

24 posts in 1343 days


#9 posted 02-22-2011 05:36 PM

Ok, so I checked it with an engineer friend. Turns out the sag was really the hardboard and the way I attached it.
So we took it off and reattached it so that it didnt have any spaces between it and the box. : )

View Derek Lyons's profile

Derek Lyons

584 posts in 2221 days


#10 posted 02-28-2011 05:45 PM

Cool, good to hear!

-- Derek, Bremerton WA --

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